/Engine/Plugins/Runtime/Synthesis/Source/Synthesis/Public/Flexiverb.h
FFlexiverbFlexiverb is a computationally inexpensive single-channel reverb algorithm optimized for maximizing echo density with as few multiplies as possible. This effect is best suited for emulating small room reverberation on platforms where CPU resources are limited. At longer decay times, this reverb algorithm begins to sound very metallic. This algorithm uses a Householder matrix as the scattering matrix for an FDN. More information on this can be found here:https://ccrma.stanford.edu/~jos/pasp/Householder_Feedback_Matrix.html
class FFlexiverb